RPM / Frequency Color Plot best strategy

Hello,
I'm trying to do some Order Spectra Analysis and I'm receiving an Out of Memory error once I'm trying to plot an RPM-Frequency colormap. I'm not sure I'm doing the right thing that is why I need some help from you. The data I'm trying to analyze it is offline data sampled at 51.2kS - a few minutes. I'm reading from the TDMS file chunks of 10 seconds (max 512kS) and for each chunk I'm using the OAT Analog Tacho processing for speed calculation and OAT Spectral MAP (Waterfall) to process the data. I'm using the Waterfall and not the Colormap because I'm buffering the spectrum using SVX Buffer Waterfall Graph (Waterfall Data).vi. Once I'm process all the chunks I'm converting all Waterfall Data to Colormap data using SXV Convert Waterfall to Colormap.vi. When I'm using the OAT spectral map, I select the window length depending of the X scale of the color plot, Width of the Colormap and Sampling Rate to make sure I will not have more that 1 frequency line / pixel. Unfortunately I can not do the same thing on the Y axis because I don't know the RPM limits of the signal so I can not adjust speed segment step to an RPM that is efficient for the resolution of the graph and maybe that cause the Out of Memory error when I'm trying to do RPM / Frequency analysis. What is strange is that sometimes the output of the spectra analysis is very strange, the value of the dz (RPM step) is negative. For example if I set 125 RPM then the dz it comes -125. What could cause this issue and how can I improve my code ?
Thanks in advance,
Alex

Hi Alex,
There are some general ideas for improving the efficiency of your code listed in the article How Can I Optimize the Memory Use in My LabVIEW VI?. A full description is laid out in VI Memory Usage.
After trying those steps, if you still need more memory, try increasing the amount of memory that LabVIEW can access in your system as described in the article How Much Memory can LabVIEW 32-bit or 64-bit Use? or you could consider creating virtual memory as described in How Can Virtual Memory Help with Memory Issues in LabVIEW?
Another option is to isolate the source of the issue. You can use the VI Profiler to diagnose your VIs (if you have subVIs) and see which one is consuming too much memory. This is described in the article How Do I Use the VI Profile Window?
- Regards,
Beutlich

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